Downcomer construction for blast-furnaces.



J. KENNEDY. DOWNCOMBR CONSTRUCTION FOR BLAST FURNACES.

APPLICATION FILED 001111, 1911.

Patented June 10, 1913.

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"Pittsburgh, Allegheny county, Pennsylvaaccompanying this specification, in wh1ch- L portion. of a .duit

* the interior JULIAN KENNEDY, PITTSBURGH, PENNSYLVANIA.

nownoomnza oonsranorron rozs BLAST-FURNACES.

Specification of Letters Patent. Application filed October 11, 1911.

nooasaa.

Serial No. 654,083.

branch downcoiner having a bleeder connection opening 5. In this case the ribs (3 are arranged in the portions of the branch pipe in front of and also beyond the blccder pipe entrance. The section of' the'pipe which ribs is shown formed of a sin- Tr) all whom 2'1 may concern.

Belt known that I, JULIAN KENNEDY, of

nia, have invented a new and useful Downcomer Construction for Blast-Fiu'naces, of which the following is full, clear and eX- act description, reference being had to the drawings, forming part of carries these gle casing having the bleeder-pipe connection cast integral therewith.

1* igure 1 is a sectional viewof one portion of the downcomer pipe; Fig. 2 is a sectional view, and Fig. 3 an elevation, of another downeomer pipe. of a downcomer piping or 0011- s for blast furnaces, the fine ore, dust, carried by the outgoing gases rapidly portions of the condults wlnch are curved to change the direction of the currents of the gas currents, thus making the life of these portions of the downcomer system comparatively short. 7

The object of my invention is to lengthenthe life of such curved portions of the gas conduits by providing protecting means for surfaces of the conduit walls. n carrying oiit my invention, I preferfrom the use of the inwardly 0n the curved'portions' of the pipes, which, as above stantially dead layer of and pipe from the flowing past.

Many changes may be made in the form and arrangement of the downcomer system, the construction of the curved portions and ribs,- as well as the form and arrangement of the ribs, without departing vention. I claimz 1. A downcomer pipe for blast-furnaces, having'a curved portion wh'ose outer wall is provided on its inner surface with a pludowncomer stated, form a subgases, collect dust, In the use cutting action of the gases ably provide these curved portions of the ralityof ribs or projections, tlze spaces bewalls with pro ecting ribs 011 the deflecting tween said nice forming pockets closed at are preferably transverse, and also substancurved portion is shown as consisting of surface portions thereof, which ribs will collect dust, and also serve to retain adead layer of gases and thereby largely protect the walls from the cutting action of the gases. This arrangement also tends to produce eddy currents, whichfurther protects the walls from the currents of gas.flowthe r outer sides v 2. A downcomer pipe for blast-furnaces, having a curved portion whose outer wall is provided on its inner-surface with a succeswhieh ribs forming outer sides; substantially as described.

mg by. a 3. A downcomer pipe for blast-furnaces, In Fig. 2 I have shown a CUIVGClPOl'tlOIl having a curved portlon whose outer wall is' of a blastfurnace downeomer pipe. This provided on its inner surface ,with-a succession of transverse radial ribs. said ribs and outenwail forming a series of gas-retaining pockets which act to protect said wall against the cutting action of the furnace gases; substantially as described.

In testimony whereof, I have hereunto set.

my hand.

J ULIAN KENNEDY. Witnesses:

C. P. BrnNns, R. A. BALnnnsoN.

cast pipe sections having ribs 6 on the inner surface of its outer Wall, this being the por' tion which deflects the currents of gases passing" theretl'irongh. These ribs may ta per toward the ends and gradually merge into the Wall of the pipe. iVhile they may be arranged in any desirable manner, they .tlally radiaLx V y In Figs. 2 and 3 I show a portion of a he advantages of my invention result projecting ribs from my in-' substantially as described.

slon of transverse ribs, the spaoes betweenv pockets closed at their Patented June it), 1913.

serve to protect these portions of thev 

